warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavio

最新推荐文章于 2022-04-21 10:26:31 发布
转载 最新推荐文章于 2022-04-21 10:26:31 发布 · 645 阅读 · 0

本文介绍了解决使用'dynamic_cast'时遇到的问题的方法。当项目未开启运行时类型信息(RTTI)支持时，使用'dynamic_cast'会导致编译错误。文中提供了解决方案：通过菜单Project－Setting－C/C++ Language－Enable run-time type information (RTTI)，从而成功启用RTTI支持。

是因为没有打开run-time   type   information   支持就使用'dynamic_cast'    


  菜单project－setting－c/c++  

  c++   language - enable   run-time   type   information   (RTTI)  


c++：警告：warning: catching polymorphic type ‘class std::exception’ by value
mzhan017的博客
11-22 2167
文章目录警告gcc 选项原因 警告 exception.cpp: In function ‘int main()’: exception.cpp:14:17: warning: catching polymorphic type ‘class std::exception’ by value [-Wcatch-value=] catch(exception e) 通过值，来捕获的多态类型”class std::exception"。 gcc 选项 -Wcatch-value=n (C++ and Ob
C++代码强制转换之dynamic_cast
新兴IT民工的专栏
12-23 304
dynamic_cast 是 C++ 中用于在运行时进行类型转换的操作符，主要用于处理多态类型（即包含虚函数的类）。它允许将基类指针或引用安全地转换为派生类指针或引用。如果转换失败，dynamic_cast 会返回 nullptr（对于指针）或抛出 std::bad_cast 异常（对于引用）。
warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavior may result
foreverxyz的专栏
09-06 4914
是因为没有打开run-time   type   information   支持就使用dynamic_cast       菜单project－setting－c/c++    c++   language - enable   run-time   type   information   (RTTI)    
warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable beh
众神都睡着
05-29 1365
今天在VC6.0中使用dynamic_cast warning C4541: 'dynamic_cast' used on polymorphic type 'class MyObject' with /GR-; unpredictable behavior may result. 而这个警告实际上是一个严重的错误，回导致程序异常中止，可我检查发现代码上没有错误啊?! 后来上MSDN查询编译器
使用Dynamic_cast出现警告信息
jq_sky的专栏
12-10 796
 VC++6.0中使用Dynamic_cast有时会出现警告信息:“warning   C4541:   dynamic_cast   used   on   polymorphic   type   class   ***   with   /GR-;   unpredictable   behavior   may   result ”。 这是因为没有打开RTTI，运行时会出现错误。打
转：VC6.0中C4541号警告的原因以及解决方案 (dynamic_cast出错)
miyunhong的专栏
01-15 2198
转：http://hi.baidu.com/nkhzj/blog/item/0c4ade167010a81b972b4307.html 今天在VC6.0中使用dynamic_castwarning C4541: dynamic_cast used on polymorphic type class MyObject with /GR-; unpredictable behavior
vc++ warning C4541 'typeid' used on polymorphic type with GR-
weixin_33897722的博客
03-13 241
在vc2008编译器下使用c++ typeid操作符时，提示如下警告，并在运行时崩溃。 warning C4541: 'typeid' used on polymorphic type 'XXX' with /GR-; unpredictable behavior may result. 在vc++编译器中，“/GR”选项的作用如下： When /GR is on, ...
error C2660: 'GetParent' : function does not take 0 parameters error C2065: 'nullptr' : undeclared identifier error C2446: '!=' : no conversion from 'int' to 'class CWnd *' Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast error C2040: '!=' : 'class CWnd *' differs in levels of indirection from 'int' warning C4541: 'dynamic_cast' used on polymorphic type 'class CWnd' with /GR-; unpredictable behavior may result
06-05
最后，关于警告C4541：这通常是因为在调试模式下使用了多态类型转换（dynamic_cast）而项目设置中没有启用RTTI。我们前面已经提到了启用RTTI的设置。如果问题依旧，我们可以尝试使用传统的转型方式（但不如dynamic_...
GCC 9.4 编译error: catching polymorphic type ‘class std::bad_alloc’ by value [-Werror=catch-value=]
lm_hao的专栏
04-21 3953
环境 lm@lm:~$ uname -a Linux leimin 5.4.0-107-generic #121-Ubuntu SMP Thu Mar 24 16:04:27 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux lm@lm:~$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper OFFLOAD_
home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] make[2]: *** [src/CMakeFiles/pangolin.dir/build.make:752：src/CMakeFiles/pangolin.dir/video/drivers/ffmpeg.cpp.o] 错误 1 make[2]: *** 正在等待未完成的任务.... In file included from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varvalue.h:32, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/var.h:35, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varextra.h:32, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/pangolin.h:53, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/video/drivers/firewire.h:31, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/src/video/video.cpp:31: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = std::__cxx11::basic_string<char>; S = bool]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] 81 | }catch(BadInputException) { | ^~~~~ /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = std::__cxx11::basic_string<char>]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = double]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = float]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = long int]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = int]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = short int]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h: In instantiation of ‘void pangolin::VarWrapper<T, S>::Set(const T&) [with T = bool; S = bool]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:76:10: required from here /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/var/varwrapper.h:81:10: warning: catching polymorphic type ‘struct pangolin::BadInputException’ by value [-Wcatch-value=] In file included from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/log/packetstream.h:33, from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/src/log/packetstream.cpp:28: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h: In function ‘bool pangolin::json::_parse(Context&, pangolin::json::input<Iter>&) [with Context = pangolin::json::default_parse_context; Iter = std::istreambuf_iterator<char, std::char_traits<char> >]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h:336:12: warning: ‘<anonymous>.pangolin::json::value::u_’ may be used uninitialized in this function [-Wmaybe-uninitialized] 336 | u_ = x.u_; | ~~~^~~~~~ In file included from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/src/var/vars.cpp:31: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h: In function ‘bool pangolin::json::_parse(Context&, pangolin::json::input<Iter>&) [with Context = pangolin::json::default_parse_context; Iter = std::istreambuf_iterator<char, std::char_traits<char> >]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h:336:12: warning: ‘<anonymous>.pangolin::json::value::u_’ may be used uninitialized in this function [-Wmaybe-uninitialized] 336 | u_ = x.u_; | ~~~^~~~~~ In file included from /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/src/console/ConsoleView.cpp:3: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h: In function ‘bool pangolin::json::_parse(Context&, pangolin::json::input<Iter>&) [with Context = pangolin::json::default_parse_context; Iter = std::istreambuf_iterator<char, std::char_traits<char> >]’: /home/lee/ORB_SLAM2-master/Thirdparty/Pangolin-0.5/include/pangolin/utils/picojson.h:336:12: warning: ‘<anonymous>.pangolin::json::value::u_’ may be used uninitialized in this function [-Wmaybe-uninitialized] 336 | u_ = x.u_; | ~~~^~~~~~ make[1]: *** [CMakeFiles/Makefile2:411：src/CMakeFiles/pangolin.dir/all] 错误 2 make: *** [Makefile:130：all] 错误 2
最新发布
12-09
catching polymorphic type ‘struct pangolin::BadInputException’ by value ``` **原因**：C++ 多态异常应通过引用捕获，值捕获会导致对象切片[^2] **修复方法**： 1. 定位抛出异常的代码文件（通常为 `src/...
dynamic_cast与polymorphic_cast再比较
boluo1982107的专栏
11-06 1147
在前面一篇文章中，我曾说过：polymorphic_cast和dynamic_cast不同的地方，就是它优秀的地方；这话不全对。如果在程序中，不认为失败的多态指针转型是错误的话，那么就应该使用dynamic_cast函数，而不是polymorphic_cast函数。例如，一种常见的情形就是使用dynamic_cast函数对特定的类型进行测试。在进行数种类型之间的转换时，通过使用异常处理来进行测
VC6.0中C4541号警告的原因以及解决方案
willnow的专栏
07-09 1448
原文：http://hi.baidu.com/nkhzj/blog/item/0c4ade167010a81b972b4307.htmlVC6.0中C4541号警告的原因以及解决方案2007-09-05 15:04今天在VC6.0中使用dynamic_castwarning C4
使用dynamic_cast报错source type is not polymorphic
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